定义

a boundary: 边界,范围,分界线 noun
There are certain boundaries which you should respect. 这里有某种界限你应该尊守。
The boundary between Mexico and the United States is heavily guarded. 墨西哥和美国之间的边界戒备森严。

UK: The boundary between Mexico and the United States is heavily-guarded.
US: There are certain boundaries which you should respect.
  • "Susie : Jean doesn't seem to understand that there are certain boundaries in the workplace which he should respect."
  • "Rugby fan : Well, apart from the obvious geographical reasons, there does seem to be a sense of unity that transcends national boundaries."
  • "Would you care to live amongst beautiful women dedicated to exploring the boundaries of pleasure every moment of every day?"

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